A165724 Digit sums of A092571.

7, 13, 19, 55, 103, 121, 127, 163, 253, 391, 721, 793, 1063, 1441, 2719, 3313, 9595, 13045, 17863, 21889, 46243, 49891

Offset: 1

Author

Parthasarathy Nambi, Sep 25 2009

Keywords

• base
• nonn
• more

Comments

Primes in this sequence are 7, 13, 19, 103, 127,163, ....

Examples

			The digit sum of 6666666666666666666666666666666666666666661 is 253.
		

Links

• Dario Alpern, Factorization using the Elliptic Curve Method

Crossrefs

Cf. A007953, A056658, A092571.

Formula

a(n) = 1 + 6*A056658(n). [R. J. Mathar, Sep 25 2009]

a(n) = A007953(A092571(n)). - Michel Marcus, Jul 07 2023

Extensions

More terms from R. J. Mathar, Sep 25 2009